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It is composite. It is divisible by 3.
489 is a composite number that is divisible by 3.
If you can add the integers and they add up to a number divisible by 3, then the number is divisible by 3.
Yes. 1 + 2 + 9 = 12 12 is divisible by 3. If the sum of the digits of a number are divisible by 3, then the whole number is divisible by 3. 129 is a composite number because it divisible by a factor other than 1 and itself.
A prime number is not divisible by any numbers except 1 and itself. A composite number is divisible by other numbers. 9 is divisible by 3, so it is a composite number.